超硬材料網

　　摘要 本文利用六面頂壓機，在高溫高壓條件下進行了合成聚晶金剛石的實驗。研究了合成溫度對聚晶金剛石晶粒大小和黏結劑分布的影響。用掃描電子顯微鏡觀察了相同壓力、不同合成溫度條件下合成出的聚晶金剛石的斷口形貌。結果表明，合成溫度高時(1 650 o C)：晶粒尺寸稍小，金屬黏結劑分布均勻；合成溫度低時(1 590 o C)，晶粒尺寸稍大，金屬黏結劑分布不均勻。這可能是因為，當溫度高時，金剛石生長驅動力小，生長速度稍慢，在相同時間條件下，晶粒尺寸稍小。同時溫度稍高，黏結劑流動性增強，更有利于其均勻分布。(金剛石與磨料磨具工程2009年第一期)
　　
　　Abstract In this article，the influence of synthesis temperature on polycrystalline diamond(PC D)was investigated by the experiment of PCD synthesizing under high pressure and high temperature(HPHT)in a cubic press．The fractograph of synthesis PCD sample was observed by SEM at the same pressure and different synthesis temperatures．The results indicated that，the synthesis temperature affected the grain size of PCD and the distribution of the metal bond in such a rules as，the higher the temperature，the smaller the grain size，and the more uniform the distribution of metal bond，vice versa．We inferred that the diamond driving force and growth rate has decreased with the increment of temperature，SO the grain size has became smaller in the same heating time．Higher temperature enhanced the bonding fluidity simultaneously，which improved its uniform distribution.